Worked on stability improvements for the crossoverJie/starrocks repository, focusing on backend reliability in Java. Addressed a critical issue in concurrent partition handling by fixing a NullPointerException in StatisticsCalcUtils, which previously caused crashes during query execution when partitions were dropped simultaneously. The solution involved enhancing the robustness of partition ID management to ensure accurate statistics calculation under high-concurrency scenarios. Validated the fix through targeted unit testing, confirming improved resilience and reliability. Although no new features were added during this period, the work demonstrated a strong emphasis on backend development practices and maintaining system stability in complex, concurrent environments using Java.